The subject matter of this specification can be embodied in, among other things, a method that includes receiving audio data that corresponds to an utterance, obtaining a first transcription of the utterance that was generated using a limited speech recognizer. The limited speech recognizer includes a speech recognizer that includes a language model that is trained over a limited speech recognition vocabulary that includes one or more terms from a voice command grammar, but that includes fewer than all terms of an expanded grammar. A second transcription of the utterance is obtained that was generated using an expanded speech recognizer. The expanded speech recognizer includes a speech recognizer that includes a language model that is trained over an expanded speech recognition vocabulary that includes all of the terms of the expanded grammar. The utterance is classified based at least on a portion of the first transcription or the second transcription.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A computer-implemented method performed by a data processing apparatus, the method comprising: receiving audio data that corresponds to an utterance; obtaining a first transcription of the utterance that was generated using a limited speech recognizer, wherein the limited speech recognizer comprises a speech recognizer that includes a language model that is trained over a limited speech recognition vocabulary that includes one or more terms from a voice command grammar, but that includes fewer than all terms of an expanded grammar; obtaining a second transcription of the utterance that was generated using an expanded speech recognizer, wherein the expanded speech recognizer comprises a speech recognizer that includes a language model that is trained over an expanded speech recognition vocabulary that includes all of the terms of the expanded grammar; aligning the first and second transcriptions of the utterance to generate an aligned transcription; and classifying the utterance, based at least on a portion of the aligned transcription, as a voice command or a voice query.
2. The method of claim 1 , wherein the operations of at least one of the limited speech recognizer and the expanded speech recognizer are performed at a server computer device.
3. The method of claim 1 , further comprising: in response to classifying the utterance, based at least on a portion of the aligned transcription, as the voice command: generating the voice command using at least a portion of the first transcription and at least part of the second transcription; and initiating the voice command; and in response to classifying the utterance as the voice query: generating the voice query using at least a portion of the first transcription and at least part of the second transcription; and initiating the voice query.
4. The method of claim 1 , wherein the limited speech recognizer is configured to recognize one or more of a collection of placeholder terms, a collection of voice command terms, and a collection of contact names from a contact list.
5. The method of claim 1 , wherein the expanded speech recognizer is configured to recognize one or more of a collection of general grammar terms, a collection of placeholder terms, a collection of proper names, and a collection of voice command terms.
6. The method of claim 5 , wherein the expanded speech recognizer is not configured to recognize a collection of contact names from a contact list.
7. The method of claim 1 , wherein the operations of at least one of the limited speech recognizer and the expanded speech recognizer are performed at a mobile device.
8. A system comprising: a data processing apparatus; and a non-transitory memory storage storing instructions executable by the data processing apparatus and that upon such execution cause the data processing apparatus to perform operations comprising: receiving audio data that corresponds to an utterance; obtaining a first transcription of the utterance that was generated using a limited speech recognizer, wherein the limited speech recognizer comprises a speech recognizer that includes a language model that is trained over a limited speech recognition vocabulary that includes one or more terms from a voice command grammar, but that includes fewer than all terms of an expanded grammar; obtaining a second transcription of the utterance that was generated using an expanded speech recognizer, wherein the expanded speech recognizer comprises a speech recognizer that includes a language model that is trained over an expanded speech recognition vocabulary that includes all of the terms of the expanded grammar; aligning the first and second transcriptions of the utterance to generate an aligned transcription; and classifying the utterance based at least on a portion of the aligned transcription, as a voice command or a voice query.
9. The system of claim 8 , wherein the operations of at least one of the limited speech recognizer and the expanded speech recognizer are performed at a mobile device.
10. The system of claim 8 , the operations further comprising: in response to classifying the utterance, based at least on a portion of the aligned transcription, as the voice command: generating the voice command using at least a portion of the first transcription and at least part of the second transcription; and initiating the voice command; and in response to classifying the utterance as the voice query: generating the voice query using at least a portion of the first transcription and at least part of the second transcription; and initiating the voice query.
11. The system of claim 8 , wherein the limited speech recognizer is configured to recognize one or more of a collection of placeholder terms, a collection of voice command terms, and a collection of contact names from a contact list.
12. The system of claim 8 , wherein the expanded speech recognizer is configured to recognize one or more of a collection of general grammar terms, a collection of placeholder terms, a collection of proper names, and a collection of voice command terms.
13. The system of claim 12 , wherein the expanded speech recognizer is not configured to recognize a collection of contact names from a contact list.
14. A non-transitory computer readable medium storing instructions executable by a data processing apparatus and that upon such execution cause the data processing apparatus to perform operations comprising: receiving audio data that corresponds to an utterance; obtaining a first transcription of the utterance that was generated using a limited speech recognizer, wherein the limited speech recognizer comprises a speech recognizer that includes a language model that is trained over a limited speech recognition vocabulary that includes one or more terms from a voice command grammar, but that includes fewer than all terms of an expanded grammar; obtaining a second transcription of the utterance that was generated using an expanded speech recognizer, wherein the expanded speech recognizer comprises a speech recognizer that includes a language model that is trained over an expanded speech recognition vocabulary that includes all of the terms of the expanded grammar; aligning the first and second transcriptions of the utterance to generate an aligned transcription; and classifying the utterance based at least on a portion of the aligned transcription, as a voice command or a voice query.
15. The computer readable medium of claim 14 , the operations further comprising: in response to classifying the utterance, based at least on a portion of the aligned transcription, as the voice command: generating the voice command using at least a portion of the first transcription and at least part of the second transcription; and initiating the voice command; and in response to classifying the utterance as the voice query: generating the voice query using at least a portion of the first transcription and at least part of the second transcription; and initiating the voice query.
16. The computer readable medium of claim 14 , wherein the limited speech recognizer is configured to recognize one or more of a collection of placeholder terms, a collection of voice command terms, and a collection of contact names from a contact list.
17. The computer readable medium of claim 14 , wherein the expanded speech recognizer is configured to recognize one or more of a collection of general grammar terms, a collection of placeholder terms, a collection of proper names, and a collection of voice command terms.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
May 13, 2013
June 16, 2015
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.